{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-46138", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.100Z", "datePublished": "2026-05-28T09:35:54.467Z", "dateUpdated": "2026-08-05T12:30:00.334Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:30:00.334Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt\n\nhci_le_create_big_complete_evt() iterates over BT_BOUND connections for\na BIG handle using a while loop, accessing ev->bis_handle[i++] on each\niteration. However, there is no check that i stays within ev->num_bis\nbefore the array access.\n\nWhen a controller sends a LE_Create_BIG_Complete event with fewer\nbis_handle entries than there are BT_BOUND connections for that BIG,\nor with num_bis=0, the loop reads beyond the valid bis_handle[] flex\narray into adjacent heap memory. Since the out-of-bounds values\ntypically exceed HCI_CONN_HANDLE_MAX (0x0EFF), hci_conn_set_handle()\nrejects them and the connection remains in BT_BOUND state. The same\nconnection is then found again by hci_conn_hash_lookup_big_state(),\ncreating an infinite loop with hci_dev_lock held.\n\nFix this by terminating the BIG if in case not all BIS could be setup\nproperly." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 8.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - The vulnerable handler is in the Bluetooth ISO/BIS stack; per kernel CNA convention Bluetooth subsystem bugs are reachable by an attacker within Bluetooth radio range, i.e. the adjacent vector.\nAC:L - An event with num_bis=0 (or fewer bis_handle entries than bound connections) deterministically triggers the OOB read and the infinite loop; the OOB heap values reliably exceed HCI_CONN_HANDLE_MAX, so no uncontrolled condition is required.\nPR:N - Exploitation requires no privileges or credentials on the target host; the malformed BIG-complete event is processed without any authentication gate.\nUI:N - No victim interaction is needed at exploit time — the device merely has to be operating as a BIS broadcaster, which is a configuration state, not a per-attack user action.\nS:U - The OOB read and the hang are confined to the kernel's own security authority; no boundary such as a VM/hypervisor or IOMMU is crossed.\nC:H - The loop reads the bis_handle[] flex array out of bounds into adjacent heap memory (up to ~512 bytes), well beyond a few bounded bytes, which under kernel guidance is scored High.\nI:N - The bug path performs only an out-of-bounds read and a spinning lookup; there is no out-of-bounds write or memory corruption that modifies kernel state.\nA:H - The OOB values keep the connection in BT_BOUND, producing an infinite loop while hci_dev_lock is held, which hangs the HCI device and causes a denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/hci_event.c" ], "versions": [ { "version": "a0bfde167b506423111ddb8cd71930497a40fc54", "lessThan": "6cb7f67bc28da787499291a562d49a084d9c90cd", "status": "affected", "versionType": "git" }, { "version": "a0bfde167b506423111ddb8cd71930497a40fc54", "lessThan": "22559ad7654f61727fc270ee4893da9f4b70cf17", "status": "affected", "versionType": "git" }, { "version": "a0bfde167b506423111ddb8cd71930497a40fc54", "lessThan": "77981a507aa0fc001dc37f0dd6631dd2042fed17", "status": "affected", "versionType": "git" }, { "version": "a0bfde167b506423111ddb8cd71930497a40fc54", "lessThan": "665da0baaf0396f9ed3c86ccb3955dcd0b73e774", "status": "affected", "versionType": "git" }, { "version": "a0bfde167b506423111ddb8cd71930497a40fc54", "lessThan": "5ddb8014261137cadaf83ab5617a588d80a22586", "status": "affected", "versionType": "git" }, { "version": "b475c1109251e30ec21fb574d72a1c71a4ab0039", "status": "affected", "versionType": "git" }, { "version": "2ccde10127447c1a5caad8469fede945bdb62fdf", "status": "affected", "versionType": "git" }, { "version": "6.4.16", "lessThan": "6.5", "status": "affected", "versionType": "semver" }, { "version": "6.5.3", "lessThan": "6.6", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/hci_event.c" ], "versions": [ { "version": "6.6", "status": "affected" }, { "version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.140", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.88", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.30", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.7", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.6.140" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.12.88" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.18.30" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.0.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.1" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/6cb7f67bc28da787499291a562d49a084d9c90cd" }, { "url": "https://git.kernel.org/stable/c/22559ad7654f61727fc270ee4893da9f4b70cf17" }, { "url": "https://git.kernel.org/stable/c/77981a507aa0fc001dc37f0dd6631dd2042fed17" }, { "url": "https://git.kernel.org/stable/c/665da0baaf0396f9ed3c86ccb3955dcd0b73e774" }, { "url": "https://git.kernel.org/stable/c/5ddb8014261137cadaf83ab5617a588d80a22586" } ], "title": "Bluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt", "x_generator": { "engine": "bippy-1.2.0" } } } }